As smartphones get cheaper and more featureful than their stripped-down siblings, more folks are walking around with full-on operating systems in their pocket—but which is the best? Our brother site Gizmodo shows off its promiscuous use of every smartphone on the block in an informative explainer about the current roster of mobile operating systems out there, from Windows Mobile, iPhone 2.0, and Android to Symbian, BlackBerry, and Palm. In the wake of the iPhone 3G and on the eve of Android's launch, we want to know: which flavor of smartphone OS is your favorite? Cast your vote below.Best smartphone operating system you've used?( polls) A word about Lifehacker's smartphone coverage: We've gotten some (possibly justified) complaints about how we've hit iPhone 2.0 coverage harder than other operating systems, like Symbian or BlackBerry. As software reviewers (versus gadget reviewers), we write about what we know—and in the case of smartphones, what we have, and right now that's a few iPhones and Windows Mobile devices. But, we're pretty excited about the upcoming Android launch, so expect at least few posts on it in the coming months. Polls like this help us gauge interest levels in non-desktop software, so thanks for indulging us with your vote. Hit up the Giz link below for their full expert rundown of the state of your smartphone OS choices.